Brass Dome Oil Sight Glass – 1/2 NPT High Pressure Level Plug for Air Compressor

360° High-Transparency View】Our brass dome oil sight glass uses clear borosilicate dome glass for full 360° liquid observation. Staff can check oil color and liquid level from any angle quickly.

Industrial Temperature & Pressure Rated】This high pressure sight glass works safely at up to 145 PSI and -25℃~200℃. As corrosion resistant sight glass, it adapts to long-time harsh industrial running conditions.

Rugged Brass & Borosilicate Construction】This brass sight glass is machined from solid brass with shockproof dome glass. Standard NBR O-ring comes with optional Viton seal to achieve full leakproof sealing.

Versatile OEM Applications】This threaded sight glass acts as a precise liquid level indicator for air compressors, tanks, gearboxes and hydraulic pumps, matching standard 1/2” NPT equipment ports.

Flexible MOQ & Factory Support】Fanovo manufactures brass dome oil sight glass with flexible small trial orders. Every unit gets 100% pressure inspection before shipment for stable service life.

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Technical Specifications & Product Information

Fanovo Brass Dome Oil Sight Glass delivers stable performance for heavy industrial fluid monitoring. Below you can check full technical dimensions and parameter data of this threaded sight glass.

Product Information Table

Item No.Size(mm)A(mm)B(mm)C(mm)D(mm)E(mm)F(mm)SW(mm)Temperature
FN-DHO11/4″NPT 1/4″12169121021Temperature range can be customized
FN-DNO23/8″NPT 3/8″131611161324
FN-DHO31/2″NPT 1/2″141613181326
FN-DHO43/4″NPT 3/4″171620251536
FN-DHO51″NPT 1″201625301540
FN-DHO61/4″G1/4″12169121021
FN-DHO73/8″G3/8″101611161324
FN-DHO81/2″G1/2″101613181326
FN-DHO93/4″G3/4″121620251536
FN-DHO101″G1″121625301540
FN-DHO11M12M12x110169121021
FN-DHO12M12M12x1.510169121021
FN-DHO13M14M14x1.510169121021
FN-DHO14M16M16x1.5101611161324
FN-DHO15M20M20x1.5101612181326
FN-DHO16M22M22x1.5101613181326
FN-DHO17M26M26x1.5111619251436
FN-DHO18M27M27x1.5111620251536
FN-DHO19M33M33x1.5111625301540

Core Advantages & Engineering Benefit

The specific combination of materials and design in the Fanovo Brass Sight Glass translates directly into superior performance and long-term value for critical equipment.

Unyielding Performance Under Pressure & Heat
This brass sight glass adopts integrated solid brass and dome glass structure, with reliable leak-proof sealing. As high pressure sight glass, it works stably on air compressors, hydraulic units and gearboxes under high temperature and pressure.

Guaranteed Clarity & Long-Term Readability
The borosilicate dome window resists chemical corrosion and UV aging, no yellowing or blurring. Operators get clear liquid level observation throughout the whole service cycle of the liquid level indicator.

Superior Durability & Corrosion Resistance
Solid brass body features natural anti-corrosion performance, stronger shock and vibration resistance than plastic sight plugs. This corrosion resistant sight glass lowers equipment failure downtime in harsh workshop environments.

Your Direct Manufacturing Partner (OEM & Customization)
As a professional sight glass manufacturer, we support custom thread sizes, logo printing and tailored design. All customized brass dome oil sight glass fits OEM machinery and bulk distributor supply chain demands perfectly.

FeatureSpecification
Product Name1/2″ NPT Brass Dome Oil Sight Glass
Part NumberFNV-7001 Series
Body MaterialSolid Hexagonal Brass (C36000 / CZ121)
Window MaterialNatural Glass, Fused
Thread Size1/4″NPT、3/8″ NPT、1/2″NPT、3/4″ NPT、1″NPT、M12x1、M12x1.5、M14x1.5、M16x1.5、M20x1.5、M22x1.5、M26x1.5、M27x1.5、M33x1.5、G1/4″、G3/8″、G1/2″、G3/4″、 G1″
Maximum PressureUp to 125 PSI (9 Bar)
Operating TemperatureUp to 300°F (150°C)
Seal IntegrityAchieved through a high-strength fusion process between glass and brass body
Chemical ResistanceExcellent against mineral oils, petroleum, fuels, and most industrial fluids
InstallationStandard hex body for easy installation with a wrench
DesignDomed window for enhanced visibility

In addition to this size, we can also customize other sizes for you according to your needs.

If you have any other needs about this product, please feel free to contact us.

Complies with Lead Free Plumbing Laws, NSF/ ANSI 61, UPC/ CE, ISO 9001

For approval information, please refer to the products specification sheet. For any other information on product certification and documentation information, please contact Fanovo.

FANOVO STATEMENT OF WARRANTY & LIMITATION OF WARRANTY

Fanovo warrants, to our all purchasers, that its products which are delivered to its purchasers will be the kind described in the order or price list and will be free of defects in workmanship or material for a period of two year from the date of shipping to you, our purchaser.

Should any failure to conform to this warranty appear within two year after the date of the initial delivery to our purchaser, Fanovo will, upon written notification thereof and substantiation that the goods have been stored, installed, maintained and operated in accordance with Fanovo’s recommendation and standard industry practice, correct such defects by suitable repair or replacement at Fanovo’s own expense. If any valve alleged to be defective, is reported to Fanovo headquarter in China, it will be examined and, if found to be defective under the warranty, it will be replaced at no charge in future order.

THIS WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR OTHER WARRANTY OF QUALITY, WHETHER EXPRESS OR IMPLIED, EXCEPT THE WARRANTY OF TITLE AND AGAINST PATENT INFRINGEMENT Correction of non-conformities, in the manner and for the period of time provided above, shall constitute fulfillment of all liabilities of Fanovo to our purchaser, with respect to the goods, whether based on contract, negligence, strict tort or otherwise, it is the intention of Fanovo that no warranty of any kind, whether express or implied, shall pass through our purchaser to any other person or corporation.

LIMITATION OF LIABILITY: FANOVO SHALL NOT UNDER ANY CIRCUMSTANCES BE LIABLE FOR SPECIAL OR CONSEQUENTIAL DAMAGES SUCH AS, BUT NOT LIMITED TO, DAMAGES OR LOSS OF OTHER PROPERTY OR EQUIPMENT, LOSS OF PROFITS, OR REVENUE, COST OF CAPITAL, COST OF PURCHASED OR REPLACEMENT GOODS, OR CLAIMS OF CUSTOMERS OF OUR INITIAL PURCHASER. THE REMEDIES OF OUR INITIAL PURCHASER, AND ALL OTHERS, SET FORTH HEREIN ARE EXCLUSIVE, AND THE LIABILITY OF FANOVO WITH RESPECT TO SAME SHALL NOT, EXCEPT AS EXPRESSLY PROVIDED HEREIN, EXCEED THE PRICE OF GOODS UPON WHICH SUCH LIABILITY IS BASED.

Fanovo is not just innovative products—we also provide wide-ranging capabilities, including design, manufacturing, and distribution. Each of these capabilities, as well as others, can be scaled to your needs – you can use as much or as little as makes sense for your product development.

Our Strengths

  • Design/Prototyping
  • Manufacturing & Assembly
  • Custom Labeling & Packaging
  • Inventory Management
  • Continuous Improvement & Refinement

If you’re looking for an established, financially secure partner who offers robust quality systems, validated processes, continuous improvement strategies, and a proven track record, you’ve come to the right place. Contact us and we will show you the major breakthroughs OEMs have experienced with us.

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